gatsby-node.js

/**
 * Implement Gatsby's Node APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/node-apis/
 */

const path = require("path")

exports.createPages = async ({ actions, graphql, reporter }) => {
  const { createPage } = actions
  const introTemplate = path.resolve(`./src/templates/intro.js`)
  // Query all .md files and get the path value
  const result = await graphql(`
    {
      allMdx(sort: { order: DESC, fields: [frontmatter___date] }, limit: 1000) {
        edges {
          node {
            frontmatter {
              path
              title
            }
          }
        }
      }
    }
  `)
  if (result.errors) {
    reporter.panicOnBuild(`Error while running GraphQL query.`)
    return
  }

  result.data.allMdx.edges.forEach(({ node }) => {
    // If the md file has a path create a page for it
    if (node.frontmatter.path) {
      createPage({
        path: node.frontmatter.path,
        component: introTemplate,
        context: { frontmatter: { ...node.frontmatter } },
      })
    }
  })
}